Identifier     sap_mult

 Purpose        multiplicate a spectrum either by a constant or another 
                spectrum (array)

 Synopsis       sap_mult, in1flux, in1err, in2flux, in2err, outflux, outerr
                             

 Arguments      Name      I/O  Type      Description
                -----------------------------------------------------
                in1flux   I    Float(*)  array of first spectrum (flux or
                                         photocurrents)
                in1err    I    Float(*)  Array of weights for in1flux
                in2flux   I    Float(*)  array by which in1flux is to be
                                         multiplied (constant array or fluxes)
                in2err    I    Float(*)  Array of weights for in2flx
                outflux   O    Float(*)  array of Spectrum 1 after
                                         multiplication
                outerr    O    Float(*)  Array of uncertainties of outflux

 Returns        The multiplied fluxes (or photocurrents) and their propagated 
                errors. 

 Description    Multiplies a spectrum either by a constant or another spectrum
                For multiplying with a constant this constant has to be passed
                as array (from the shell arithm). The errors are propagated.

 Comment        The routine is usually called from the "shell" ARITHM which
                provides the appropriate arrays from the product structures.

 Example        ---
                               
 Dependencies   CALLS: --
                CALLED FROM: arithm

 Category       ISAP

 Filename       sap_mult.pro

 Author         A. Fiedler (--> AF)

 Version        1.0
                              
 History        0.1   27-09-95  AF 
                1.0   30-11-95  ES V1 delivery
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Copyright (C) 1995, Max-Planck-Institut fuer extraterrestrische Physik (MPE);
                    Garching, Germany                                       ;
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